United States Stove 1357M Part A, MINIMUM 12 IN TO COMBUSTIBLES, Masonry Wall, Part B, Part C

FIGURE 12, PART A

MINIMUM 12 IN.

TO COMBUSTIBLES

CHIMNEY FLUE

MASONRY CHIMNEY CONSTRUCTED TO NFPA 211

MINIMUM CHIMNEY CLEARANCE TO BRICK AND COMBUSTIBLES IS 2 IN.

MINIMUM CLEARANCES 12 IN. OF BRICK ALL AROUND

CHIMNEY CONNECTOR TO HEATER

FIRE CLAY LINER

(5/8" MIN. WALL THICKNESS)

MIN. 3-1/2" THICK BRICK

MASONRY WALL

1.Use a minimum 3-1/2" thick brick masonry wall framed into the combustible wall. A fireclay liner (ASTM C315 or equivalent) having a 5/8" minimum wall thickness must be used and it must be at least 12" away from any material that could catch fire. The inside diameter of the fireclay liner shall be sized for the proper snug fit of a 6" diameter chimney connector pipe. The fireclay liner shall run from the outer surface of the brick wall to, but not beyond, the inner surface of the chimney flue and shall be firmly cemented in place. See Part A.

FIGURE 12, PART B

MINIMUM CHIMNEY CLEARANCES FROM MASONRY TO SHEET STEEL SUPPORTS AND COMBUSTIBLES 2 IN.

		FLUE
FACTORY-BUILT		CHIMNEY
CHIMNEY LENGTH
	NONSOLUBLE
	REFACTORY
	CEMENT

CHIMNEY LENGTH

FLUSH WITH INSIDE

AIR SPACEOF FLUE 9 IN. MINIMUM

MASONRY CHIMNEY CONSTRUCTED

TO NFPA 211

AIR SPACE

MINIMUM CLEARANCE 9 IN. ALL AROUND

CHIMNEY CONNECTOR TO HEATER

USE CHIMNEY MFRS. PARTS TO

ATTACH CONNECTOR SECURELY

SOLID INSULATED, LISTED FACTORY-BUILT CHIMNEY LENGTH

SHEET STEEL SUPPORTS

(24 GAUGE MIN. THICKNESS)

2.Use a solid insulated listed factory-built chimney length having an inside diameter of 6" and having 1" or more of solid insulation. There must be at least a 9" air space between the outer wall of the chimney length and any combustible materials. The inner end of the chimney length shall be flush with the inside of the masonry chimney flue and shall be sealed to the flue and to the brick ma- sonry penetration with nonwater-soluble refractory cement. Sheet steel supports which are at least 24 gauge (0.024") in thickness shall be securely fastened to wall surfaces on all sides. Fasteners between supports and the chimney length shall not penetrate the chimney liner. See Part B.

FIGURE 12, PART C

MINIMUM CHIMNEY CLEARANCES FROM MASONRY TO SHEET STEEL SUPPORTS AND COMBUSTIBLES 2 IN.

TWO VENTILATED AIR CHANNELS EACH 1 INCH. CONSTRUCTED OF SHEET STEEL.

CHIMNEY THIMBLE

CHIMNEY FLUE

MASONRY CHIMNEY CONSTRUCTED TO NFPA 211

24 GAUGE

VENTILATED THIMBLE WITH TWO 1 INCH AIR CHANNELS

CHIMNEY CONNECTOR

TO HEATER

MINIMUM 6 IN. GLASS

FIBER INSULATION ALL AROUND

SHEET STEEL SUPPORTS (24 GAUGE MIN. THICKNESS)

3.Use a 10" diameter ventilated thimble made of at least 24 gauge (0.024") steel having two 1" air channels. The ventilated thimble must be separated from combustible materials by a minimum of 6" glass fiber insulation. The opening in the combustible wall shall be covered and the thimble supported with sheet steel supports which are at least 24 gauge (0.024") in thickness. The sheet steel supports shall be securely fastened to wall surfaces on all sides and shall be sized to fit and hold the chimney section. Fasteners used to secure chimney sections shall not penetrate chimney flue liner. See Part C.

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